Q235钢表面氩弧熔覆Mo-Si复合涂层组织和性能分析  

Analysis on property and microstructure of Mo-Si composite coating deposited by argon shielded arc on Q235 steel surface

作　　者：王永东[1] 刘兴[1] 朱艳[1] 毛新宇[1] 

机构地区：[1]黑龙江科技学院材料科学与工程学院,哈尔滨150022

出　　处：《焊接学报》2009年第5期42-44,共3页Transactions of The China Welding Institution

基　　金：哈尔滨市青年科技创新基金项目(RC2009QN017080);黑龙江省教育厅项目(11511351);科技学院引进人才项目(07-57)

摘　　要：以钼粉、硅粉为原料,利用氩弧熔覆技术在Q235钢基材表面原位合成了FeMoSi/Fe3Si金属硅化物复合涂层,应用SEM,XRD对涂层的显微组织和物相进行了分析,并测试了涂层显微硬度和常温耐磨性.结果表明,复合涂层与基体界面无气孔、裂纹,呈冶金结合;复合材料涂层由α-Fe,初生相FeMoSi三元金属硅化物树枝晶和枝晶间的鱼骨状FeMoSi/Fe3Si共晶组织组成;涂层的显微硬度达到1000 HV0.2,较基体提高3倍左右;相对耐磨性较基体Q235钢提高近11倍.Metal-silicide composite coating of FeMoSi/Fei3Si was prepared by in situ synthesis on the surface of Q235 steel by means of argon arc cladding technique with the pre-alloyed powder of Mo and Si.The microstructure and phases of coating were investigated by scanning electron microscope(SEM) and X-ray diffraction(XRD),meanwhile the microhardness and the wear resistance of coating were tested.The results show that the interface between the coating and substrate has excellent bonding and is free of pores and cracks.Microstructure of the coating is mainly composed of α-Fe,primary dendrite FeMoSi and interdendritic FeMoSi/Fe3Si eutectic structure.The microhardness was 3 times higher than that of Q235 steel and the maximum microhardness can reach 1 000 HV0.2,the wear resistance of coating was 11 times higher than that of Q235 steel substrate.

关 键 词：氩弧熔覆 复合涂层 原位合成 耐磨性 

分 类 号：TG174[金属学及工艺—金属表面处理]